190 lines
7.4 KiB
Python
190 lines
7.4 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014, 2015 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from _base import SQLBaseStore
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from twisted.internet import defer
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import OpenSSL
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from syutil.crypto.signing_key import decode_verify_key_bytes
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import hashlib
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class KeyStore(SQLBaseStore):
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"""Persistence for signature verification keys and tls X.509 certificates
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"""
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@defer.inlineCallbacks
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def get_server_certificate(self, server_name):
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"""Retrieve the TLS X.509 certificate for the given server
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Args:
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server_name (bytes): The name of the server.
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Returns:
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(OpenSSL.crypto.X509): The tls certificate.
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"""
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tls_certificate_bytes, = yield self._simple_select_one(
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table="server_tls_certificates",
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keyvalues={"server_name": server_name},
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retcols=("tls_certificate",),
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)
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tls_certificate = OpenSSL.crypto.load_certificate(
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OpenSSL.crypto.FILETYPE_ASN1, tls_certificate_bytes,
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)
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defer.returnValue(tls_certificate)
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def store_server_certificate(self, server_name, from_server, time_now_ms,
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tls_certificate):
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"""Stores the TLS X.509 certificate for the given server
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Args:
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server_name (str): The name of the server.
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from_server (str): Where the certificate was looked up
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time_now_ms (int): The time now in milliseconds
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tls_certificate (OpenSSL.crypto.X509): The X.509 certificate.
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"""
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tls_certificate_bytes = OpenSSL.crypto.dump_certificate(
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OpenSSL.crypto.FILETYPE_ASN1, tls_certificate
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)
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fingerprint = hashlib.sha256(tls_certificate_bytes).hexdigest()
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return self._simple_upsert(
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table="server_tls_certificates",
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keyvalues={
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"server_name": server_name,
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"fingerprint": fingerprint,
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},
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values={
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"from_server": from_server,
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"ts_added_ms": time_now_ms,
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"tls_certificate": buffer(tls_certificate_bytes),
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},
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desc="store_server_certificate",
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)
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@defer.inlineCallbacks
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def get_server_verify_keys(self, server_name, key_ids):
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"""Retrieve the NACL verification key for a given server for the given
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key_ids
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Args:
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server_name (str): The name of the server.
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key_ids (list of str): List of key_ids to try and look up.
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Returns:
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(list of VerifyKey): The verification keys.
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"""
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sql = (
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"SELECT key_id, verify_key FROM server_signature_keys"
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" WHERE server_name = ?"
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" AND key_id in (" + ",".join("?" for key_id in key_ids) + ")"
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)
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rows = yield self._execute_and_decode(
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"get_server_verify_keys", sql, server_name, *key_ids
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)
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keys = []
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for row in rows:
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key_id = row["key_id"]
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key_bytes = row["verify_key"]
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key = decode_verify_key_bytes(key_id, str(key_bytes))
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keys.append(key)
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defer.returnValue(keys)
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def store_server_verify_key(self, server_name, from_server, time_now_ms,
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verify_key):
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"""Stores a NACL verification key for the given server.
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Args:
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server_name (str): The name of the server.
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key_id (str): The version of the key for the server.
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from_server (str): Where the verification key was looked up
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ts_now_ms (int): The time now in milliseconds
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verification_key (VerifyKey): The NACL verify key.
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"""
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return self._simple_upsert(
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table="server_signature_keys",
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keyvalues={
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"server_name": server_name,
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"key_id": "%s:%s" % (verify_key.alg, verify_key.version),
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},
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values={
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"from_server": from_server,
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"ts_added_ms": time_now_ms,
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"verify_key": buffer(verify_key.encode()),
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},
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desc="store_server_verify_key",
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)
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def store_server_keys_json(self, server_name, key_id, from_server,
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ts_now_ms, ts_expires_ms, key_json_bytes):
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"""Stores the JSON bytes for a set of keys from a server
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The JSON should be signed by the originating server, the intermediate
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server, and by this server. Updates the value for the
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(server_name, key_id, from_server) triplet if one already existed.
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Args:
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server_name (str): The name of the server.
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key_id (str): The identifer of the key this JSON is for.
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from_server (str): The server this JSON was fetched from.
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ts_now_ms (int): The time now in milliseconds.
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ts_valid_until_ms (int): The time when this json stops being valid.
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key_json (bytes): The encoded JSON.
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"""
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return self._simple_insert(
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table="server_keys_json",
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values={
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"server_name": server_name,
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"key_id": key_id,
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"from_server": from_server,
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"ts_added_ms": ts_now_ms,
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"ts_valid_until_ms": ts_expires_ms,
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"key_json": buffer(key_json_bytes),
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},
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or_replace=True,
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)
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def get_server_keys_json(self, server_keys):
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"""Retrive the key json for a list of server_keys and key ids.
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If no keys are found for a given server, key_id and source then
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that server, key_id, and source triplet entry will be an empty list.
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The JSON is returned as a byte array so that it can be efficiently
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used in an HTTP response.
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Args:
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server_keys (list): List of (server_name, key_id, source) triplets.
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Returns:
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Dict mapping (server_name, key_id, source) triplets to dicts with
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"ts_valid_until_ms" and "key_json" keys.
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"""
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def _get_server_keys_json_txn(txn):
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results = {}
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for server_name, key_id, from_server in server_keys:
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keyvalues = {"server_name": server_name}
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if key_id is not None:
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keyvalues["key_id"] = key_id
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if from_server is not None:
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keyvalues["from_server"] = from_server
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rows = self._simple_select_list_txn(
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txn,
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"server_keys_json",
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keyvalues=keyvalues,
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retcols=(
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"key_id",
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"from_server",
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"ts_added_ms",
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"ts_valid_until_ms",
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"key_json",
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),
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)
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results[(server_name, key_id, from_server)] = rows
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return results
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return self.runInteraction(
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"get_server_keys_json", _get_server_keys_json_txn
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)
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